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The Impacts of the Tropical Pacific and Indian Ocean on Asian Monsoon Precipitation Variability
The Impacts of the Tropical Pacific and Indian Ocean on Asian Monsoon Precipitation Variability
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104703
- ISBN
- 9798291573969
- DDC
- 551.5
- 저자명
- Guderian, E.
- 서명/저자
- The Impacts of the Tropical Pacific and Indian Ocean on Asian Monsoon Precipitation Variability
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 139 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Han, Weiqing.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약The Asian monsoon refers to the "rainy season" which occurs over a brief period of 3 to 4 months and brings essential precipitation to one of the most densely populated regions in the world. Although the monsoon occurs each year, it exhibits significant year-to-year variability in the intensity and location of rainfall, which can have substantial socioeconomic consequences. Previous efforts to identify the drivers of monsoon variability have found that while tropical Pacific and Indian Ocean sea surface temperature anomalies (SSTAs) can influence Asian monsoon precipitation, the complex interactions between them make it challenging to assess the individual contribution of each ocean basin to the interannual variability of the monsoon. In this dissertation, we seek to isolate impacts of basin-wide tropical Pacific SSTAs, Indian Ocean SSTAs, and their interaction on Asian monsoon precipitation variability through the use of a linear inverse model (LIM). The LIM is constructed from monthly observations of SSTAs and precipitation anomalies from 1950 to 2019 to generate a 70,000-yr LIM control run to compare with observations. In addition, we perform a suite of LIM process experiments to evaluate the isolated tropical Pacific and Indian Ocean SSTA impacts on precipitation anomalies over the Asian monsoon region. Our results indicate that monsoon variability is enhanced by tropical Pacific SSTAs-largely due to the direct impacts of the El Nino-Southern Oscillation (ENSO)-and reduced by tropical Indian Ocean SSTAs and the Indo-Pacific interaction, especially for Indian summer monsoon rainfall (ISMR). Our new results specifically reveal the damping effect of the tropical Indo-Pacific interaction on ISMR variability, which we find can be partially explained by the opposing impacts of ENSO and the Indian Ocean dipole mode (IOD) on ISMR. We then expand on our observational analysis by applying the same LIM framework to the historical simulations of seven different large ensembles from the Coupled Model Intercomparison Project Phase 6 (CMIP6) to assess how well the models can represent the observed isolated impacts from tropical Pacific and Indian Ocean SSTAs on ISMR variability. Our results show that, in general, CMIP6 models capture the enhanced (reduced) ISMR variability due to tropical Pacific SSTAs (Indian Ocean SSTAs and the Indo-Pacific interaction) but with varying spatial patterns and magnitudes compared to observations. Composites of ISMR anomalies during independent and co-occurring ENSO and IOD events reveals substantial model biases for the impacts of Indian Ocean SSTAs on ISMR, while the effects of Pacific SSTAs and the Indo-Pacific interaction are simulated reasonably well by most models, especially E3SM-2-0. Overall, the work presented in this dissertation contributes to our understanding of the complex tropical SST-monsoon system and has important applications for improving monsoon rainfall predictions and interpreting its future projections.
- 일반주제명
- Atmospheric sciences
- 일반주제명
- Physical oceanography
- 일반주제명
- Meteorology
- 일반주제명
- Climate change
- 키워드
- Climate
- 키워드
- Monsoon
- 키워드
- Pacific Ocean
- 키워드
- Tropical Ocean
- 기타저자
- University of Colorado at Boulder Atmospheric and Oceanic Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798291573969
■035 ▼a(MiAaPQ)AAI32116472
■040 ▼aMiAaPQ▼cMiAaPQ
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■1001 ▼aGuderian, E.▼0(orcid)0009-0000-4583-711X
■24510▼aThe Impacts of the Tropical Pacific and Indian Ocean on Asian Monsoon Precipitation Variability
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a139 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Han, Weiqing.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aThe Asian monsoon refers to the "rainy season" which occurs over a brief period of 3 to 4 months and brings essential precipitation to one of the most densely populated regions in the world. Although the monsoon occurs each year, it exhibits significant year-to-year variability in the intensity and location of rainfall, which can have substantial socioeconomic consequences. Previous efforts to identify the drivers of monsoon variability have found that while tropical Pacific and Indian Ocean sea surface temperature anomalies (SSTAs) can influence Asian monsoon precipitation, the complex interactions between them make it challenging to assess the individual contribution of each ocean basin to the interannual variability of the monsoon. In this dissertation, we seek to isolate impacts of basin-wide tropical Pacific SSTAs, Indian Ocean SSTAs, and their interaction on Asian monsoon precipitation variability through the use of a linear inverse model (LIM). The LIM is constructed from monthly observations of SSTAs and precipitation anomalies from 1950 to 2019 to generate a 70,000-yr LIM control run to compare with observations. In addition, we perform a suite of LIM process experiments to evaluate the isolated tropical Pacific and Indian Ocean SSTA impacts on precipitation anomalies over the Asian monsoon region. Our results indicate that monsoon variability is enhanced by tropical Pacific SSTAs-largely due to the direct impacts of the El Nino-Southern Oscillation (ENSO)-and reduced by tropical Indian Ocean SSTAs and the Indo-Pacific interaction, especially for Indian summer monsoon rainfall (ISMR). Our new results specifically reveal the damping effect of the tropical Indo-Pacific interaction on ISMR variability, which we find can be partially explained by the opposing impacts of ENSO and the Indian Ocean dipole mode (IOD) on ISMR. We then expand on our observational analysis by applying the same LIM framework to the historical simulations of seven different large ensembles from the Coupled Model Intercomparison Project Phase 6 (CMIP6) to assess how well the models can represent the observed isolated impacts from tropical Pacific and Indian Ocean SSTAs on ISMR variability. Our results show that, in general, CMIP6 models capture the enhanced (reduced) ISMR variability due to tropical Pacific SSTAs (Indian Ocean SSTAs and the Indo-Pacific interaction) but with varying spatial patterns and magnitudes compared to observations. Composites of ISMR anomalies during independent and co-occurring ENSO and IOD events reveals substantial model biases for the impacts of Indian Ocean SSTAs on ISMR, while the effects of Pacific SSTAs and the Indo-Pacific interaction are simulated reasonably well by most models, especially E3SM-2-0. Overall, the work presented in this dissertation contributes to our understanding of the complex tropical SST-monsoon system and has important applications for improving monsoon rainfall predictions and interpreting its future projections.
■590 ▼aSchool code: 0051.
■650 4▼aAtmospheric sciences
■650 4▼aPhysical oceanography
■650 4▼aMeteorology
■650 4▼aClimate change
■653 ▼aClimate
■653 ▼aEl Nino-Southern Oscillation
■653 ▼aMonsoon
■653 ▼aPacific Ocean
■653 ▼aTropical Ocean
■690 ▼a0725
■690 ▼a0415
■690 ▼a0404
■690 ▼a0557
■71020▼aUniversity of Colorado at Boulder▼bAtmospheric and Oceanic Sciences.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358444▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
